Quick-change punch



Sep. 9 1924.

E. E. LUCE QUICK CHANGE PUNCH Filed dan. 2l 1922 FE LLL.

Il xlf.. IH,I

fullyclear, and exact-description ofthe-inf Patented Sept. 9, 1924.

f :'YJUANITYED;STA-TES? euren-CHANGE mincir-Q- Application led January 21,1922. :Serial No-- 530,-78'1w5 dent of Swanton, inthe county4 of Fultony and Stateof` Ohio, have made an invention appertaining to a Quick-Change lPunch;-

and I do herebydeclarethe following to be a vent-ion, such'as will enable others skilled in the art to which itappertains .to make and use the same, reference being had-to the accompanying drawingsI andto the characters of reference `marked thereon, which form a part of this specification. ,v

This inventionelates, particularly to1 punches of thetypeused in connection with punch ,presses-hand has foruitsobject. the provision of `a Lpunclrhaving `adetachablel punch point which is` capable of being easily and yquickly changed to. suitthe -size of'l hole to be punched? or to substitute 'a -new point lfor a Vworn or broken. one, thereb'yef-v fecting a very 'materialsavingof the time, labor` and expenseA necessary to: 'exchange punchesof the'typeheretofore used. l

The invention is fully described in the following specication," and while, in .its

broader aspect, it is capable of embodiment in numerous formsa preferred embodiment thereof is illustrated in the accompanying drawings, in which,-

Fig. 1 is a fragmentary sideelevation of a punch press plunger with apunch embodying the invention clamped thereto and -with the clamping plate in section. Fig-2 is a fragmentary view of the inner side of the clamping plate with a punch secured therein. Fig. 3 is a central longitudinal section of a punch embodying the invention with parts in full, and Figs. 4 and 5 are side views of punch points of dierent sizes adapted to use in the punch.

Referring to the drawings, 1 designates 4 the punch carrying spindle or plunger of a punch press, and 2 a punch clamping plate secured to the outer end of the spindleby screws', or in any other similar. manner.

The plate 2 is providedvwith an opening 4' having an undercut inner edge portion for receiving and clamping the socket member ,y

of the punch to the spindle.

A punch embodying the invention comprises a socket or body member 5, a punch point holder 6 removably carried by the Socket member, a punchv point 7 releasably carried by the ho1der,'and a thrust bar 8 "EMMETT' E. LUCE, or' SWNTONaOt-)iv constituting apunclrsupportwand,which'jis mounted in ,the holder` 6 withlit's outer'end thrust` againstl the f inner yend :of i thel punch point,- and its inner .end thrust against the` 60 solidwall-or base ofthesocketwmember.

I The socketmember5 isiof-,a size adaptedv v to 'project through .-thef clamping: rplate holel 4 and has its inneinenthwhich bears against' the spindle end, provided with a` flange; 9i -65 r yfor-.entering t-heyundercut vedge' portionof the hole. The..outerendiofwthe member 5;-is;

axially socketed ,andl -therinnenendof-theholder Gis intendedto',;have.`a:turning f1t- 1 therein, the two members-,having a ground 70 fit at the inner end portion of the socket,

as shown at 10,', anda-:ground vtat vthe, uf'

outerwend portion ofthe socket, asasho'w'n at y 11, with the' portions intermediate the bearing-portions '10' and: 11 .in l threadedl en-v 75 gagement,as,.shown at 12.'. The diameterv ofthebearing l.surfaces10fis less than-.the

Adiameter, ,of thethreaded. plQrtions of, the

twoVr members to permitlthe .innerendlof -the' holder to 1be inserted; into;the-socketlbe-l 8,0 l i yond its--threadedportion.v 4Connecting the? two body members andv of the punchin l this. manner; .provides an extendedwbearing coaction therebetween which prevents relative lateral vmovements thereof. t

rllhe holder 6 is provided axially there-` through with an opening 13 for receivingl the punch support 8 and the` outer end of such opening is conically restricted, vas' shown at 14, to receive the outward thrusty of the conical body or base portion 15 of a punch point 7, ythe outer work punching y end of such point being projected beyond they end of the holder. The-outer sidey of the holder 6 without the socket" member 5 is preferably provided with flattened surfaces therearound to facilitategripping the same with a wrench. i

The punch pointisupport 8 isof` cylindrical bar form adapted' to loosely `fit inthe holder opening 13 with one end preferably enlarged and bearing against the base or solid wall of the socket in the member 5 land with the `other end bearing against the inner end of the punch point 7 to hold its 105 vconical portion yfirmly seated inthe conicaly lthe `punch point to the holder provides a firm and rigid mounting for the point, as the socket member 5 is firmly clamped against movement relative to the punch spindle 1, the holder 6 is rmly mounted against lateral movements relative to the socket member and the punch point is lirmly held to its seat in the tapered portion of theholder by the thrust of the bar 8 thereagainst. To remove a punch point from the holder it is only necessary toV unscrew the holder 6v from engagement with the socket member 5, withdraw the thrust bar 8 therefrom, and turn the holder in position for the punch point to pass therethrough towards its inner end and drop therefrom by gravity after which a dilferent point may be inserted in Jthe holder and the relation.

I wish it understood that my invention is not limited to any specific construction, arrangement or form of the parts, as it is capable of embodiment in numerous forms without departing from the spirit of the claims.

Having thus described my invention, what I claim as new and desire to secure by Letters Patent is,--

1. In a punch, a member having'a socket which is spaced from the inner end of the member to form a solid wall and which extends through the outer end ofthe member, said socket being threaded at its central portion and having the port-ions thereof between the ends of the threaded portion and the ends of the socket ground to form inner and outer side bearing surfaces, a. holder parts again assembled in operative of the punch point and having its .opposite end enlarged and extending over the inner end ofthe holder andengaged with the saidy inner side bearing' surface and solid wall of the socket. Y t

2. In a punch, a member having a socket which extends through the outer end of the i member, saidsocke't'being.threaded at its central portion and having the portions thereof between the endsy 4of the threaded portion and the ends of the socket ground to form inner and outer side bearing surfaces,

a `holder having an intermediate threadedportion engaged with said central threaded portion ofthe socketv and having inner and outer ground portions lto engage the respective inner and outer side hearing surfaces of the socket` with a close ground fit, saidv holder having an axial bore, a punchpoint carried by the outer endr of the holder,V andy punch supporting means yremovably engaged in the vbore of 'theholden In ltestimony whereofv I have hereunto signed my name to this specification.

EMMETTE. LUCE; 

